2 * IDE ATAPI streaming tape driver.
4 * Copyright (C) 1995-1999 Gadi Oxman <gadio@netvision.net.il>
5 * Copyright (C) 2003-2005 Bartlomiej Zolnierkiewicz
7 * This driver was constructed as a student project in the software laboratory
8 * of the faculty of electrical engineering in the Technion - Israel's
9 * Institute Of Technology, with the guide of Avner Lottem and Dr. Ilana David.
11 * It is hereby placed under the terms of the GNU general public license.
12 * (See linux/COPYING).
14 * For a historical changelog see
15 * Documentation/ide/ChangeLog.ide-tape.1995-2002
18 #define DRV_NAME "ide-tape"
20 #define IDETAPE_VERSION "1.20"
22 #include <linux/module.h>
23 #include <linux/types.h>
24 #include <linux/string.h>
25 #include <linux/kernel.h>
26 #include <linux/delay.h>
27 #include <linux/timer.h>
29 #include <linux/interrupt.h>
30 #include <linux/jiffies.h>
31 #include <linux/major.h>
32 #include <linux/errno.h>
33 #include <linux/genhd.h>
34 #include <linux/slab.h>
35 #include <linux/pci.h>
36 #include <linux/ide.h>
37 #include <linux/smp_lock.h>
38 #include <linux/completion.h>
39 #include <linux/bitops.h>
40 #include <linux/mutex.h>
41 #include <scsi/scsi.h>
43 #include <asm/byteorder.h>
44 #include <linux/irq.h>
45 #include <linux/uaccess.h>
47 #include <asm/unaligned.h>
48 #include <linux/mtio.h>
51 /* output errors only */
53 /* output all sense key/asc */
55 /* info regarding all chrdev-related procedures */
56 DBG_CHRDEV = (1 << 2),
57 /* all remaining procedures */
61 /* define to see debug info */
62 #define IDETAPE_DEBUG_LOG 0
65 #define debug_log(lvl, fmt, args...) \
67 if (tape->debug_mask & lvl) \
68 printk(KERN_INFO "ide-tape: " fmt, ## args); \
71 #define debug_log(lvl, fmt, args...) do {} while (0)
74 /**************************** Tunable parameters *****************************/
76 * After each failed packet command we issue a request sense command and retry
77 * the packet command IDETAPE_MAX_PC_RETRIES times.
79 * Setting IDETAPE_MAX_PC_RETRIES to 0 will disable retries.
81 #define IDETAPE_MAX_PC_RETRIES 3
84 * The following parameter is used to select the point in the internal tape fifo
85 * in which we will start to refill the buffer. Decreasing the following
86 * parameter will improve the system's latency and interactive response, while
87 * using a high value might improve system throughput.
89 #define IDETAPE_FIFO_THRESHOLD 2
92 * DSC polling parameters.
94 * Polling for DSC (a single bit in the status register) is a very important
95 * function in ide-tape. There are two cases in which we poll for DSC:
97 * 1. Before a read/write packet command, to ensure that we can transfer data
98 * from/to the tape's data buffers, without causing an actual media access.
99 * In case the tape is not ready yet, we take out our request from the device
100 * request queue, so that ide.c could service requests from the other device
101 * on the same interface in the meantime.
103 * 2. After the successful initialization of a "media access packet command",
104 * which is a command that can take a long time to complete (the interval can
105 * range from several seconds to even an hour). Again, we postpone our request
106 * in the middle to free the bus for the other device. The polling frequency
107 * here should be lower than the read/write frequency since those media access
108 * commands are slow. We start from a "fast" frequency - IDETAPE_DSC_MA_FAST
109 * (1 second), and if we don't receive DSC after IDETAPE_DSC_MA_THRESHOLD
110 * (5 min), we switch it to a lower frequency - IDETAPE_DSC_MA_SLOW (1 min).
112 * We also set a timeout for the timer, in case something goes wrong. The
113 * timeout should be longer then the maximum execution time of a tape operation.
117 #define IDETAPE_DSC_RW_MIN 5*HZ/100 /* 50 msec */
118 #define IDETAPE_DSC_RW_MAX 40*HZ/100 /* 400 msec */
119 #define IDETAPE_DSC_RW_TIMEOUT 2*60*HZ /* 2 minutes */
120 #define IDETAPE_DSC_MA_FAST 2*HZ /* 2 seconds */
121 #define IDETAPE_DSC_MA_THRESHOLD 5*60*HZ /* 5 minutes */
122 #define IDETAPE_DSC_MA_SLOW 30*HZ /* 30 seconds */
123 #define IDETAPE_DSC_MA_TIMEOUT 2*60*60*HZ /* 2 hours */
125 /*************************** End of tunable parameters ***********************/
127 /* tape directions */
129 IDETAPE_DIR_NONE = (1 << 0),
130 IDETAPE_DIR_READ = (1 << 1),
131 IDETAPE_DIR_WRITE = (1 << 2),
137 struct idetape_bh *b_reqnext;
141 /* Tape door status */
142 #define DOOR_UNLOCKED 0
143 #define DOOR_LOCKED 1
144 #define DOOR_EXPLICITLY_LOCKED 2
146 /* Some defines for the SPACE command */
147 #define IDETAPE_SPACE_OVER_FILEMARK 1
148 #define IDETAPE_SPACE_TO_EOD 3
150 /* Some defines for the LOAD UNLOAD command */
151 #define IDETAPE_LU_LOAD_MASK 1
152 #define IDETAPE_LU_RETENSION_MASK 2
153 #define IDETAPE_LU_EOT_MASK 4
155 /* Structures related to the SELECT SENSE / MODE SENSE packet commands. */
156 #define IDETAPE_BLOCK_DESCRIPTOR 0
157 #define IDETAPE_CAPABILITIES_PAGE 0x2a
160 * Most of our global data which we need to save even as we leave the driver due
161 * to an interrupt or a timer event is stored in the struct defined below.
163 typedef struct ide_tape_obj {
165 struct ide_driver *driver;
166 struct gendisk *disk;
169 /* used by REQ_IDETAPE_{READ,WRITE} requests */
170 struct ide_atapi_pc queued_pc;
173 * DSC polling variables.
175 * While polling for DSC we use postponed_rq to postpone the current
176 * request so that ide.c will be able to service pending requests on the
177 * other device. Note that at most we will have only one DSC (usually
178 * data transfer) request in the device request queue.
180 struct request *postponed_rq;
181 /* The time in which we started polling for DSC */
182 unsigned long dsc_polling_start;
183 /* Timer used to poll for dsc */
184 struct timer_list dsc_timer;
185 /* Read/Write dsc polling frequency */
186 unsigned long best_dsc_rw_freq;
187 unsigned long dsc_poll_freq;
188 unsigned long dsc_timeout;
190 /* Read position information */
193 unsigned int first_frame;
195 /* Last error information */
196 u8 sense_key, asc, ascq;
198 /* Character device operation */
202 /* Current character device data transfer direction */
205 /* tape block size, usually 512 or 1024 bytes */
206 unsigned short blk_size;
209 /* Copy of the tape's Capabilities and Mechanical Page */
213 * Active data transfer request parameters.
215 * At most, there is only one ide-tape originated data transfer request
216 * in the device request queue. This allows ide.c to easily service
217 * requests from the other device when we postpone our active request.
220 /* Data buffer size chosen based on the tape's recommendation */
223 struct idetape_bh *merge_bh;
224 /* size of the merge buffer */
226 /* pointer to current buffer head within the merge buffer */
227 struct idetape_bh *bh;
231 int pages_per_buffer;
232 /* Wasted space in each stage */
235 /* Measures average tape speed */
236 unsigned long avg_time;
240 /* the door is currently locked */
242 /* the tape hardware is write protected */
244 /* the tape is write protected (hardware or opened as read-only) */
250 static DEFINE_MUTEX(idetape_ref_mutex);
252 static struct class *idetape_sysfs_class;
254 static void ide_tape_release(struct device *);
256 static struct ide_tape_obj *ide_tape_get(struct gendisk *disk)
258 struct ide_tape_obj *tape = NULL;
260 mutex_lock(&idetape_ref_mutex);
261 tape = ide_drv_g(disk, ide_tape_obj);
263 if (ide_device_get(tape->drive))
266 get_device(&tape->dev);
268 mutex_unlock(&idetape_ref_mutex);
272 static void ide_tape_put(struct ide_tape_obj *tape)
274 ide_drive_t *drive = tape->drive;
276 mutex_lock(&idetape_ref_mutex);
277 put_device(&tape->dev);
278 ide_device_put(drive);
279 mutex_unlock(&idetape_ref_mutex);
283 * The variables below are used for the character device interface. Additional
284 * state variables are defined in our ide_drive_t structure.
286 static struct ide_tape_obj *idetape_devs[MAX_HWIFS * MAX_DRIVES];
288 static struct ide_tape_obj *ide_tape_chrdev_get(unsigned int i)
290 struct ide_tape_obj *tape = NULL;
292 mutex_lock(&idetape_ref_mutex);
293 tape = idetape_devs[i];
295 get_device(&tape->dev);
296 mutex_unlock(&idetape_ref_mutex);
300 static int idetape_input_buffers(ide_drive_t *drive, struct ide_atapi_pc *pc,
303 struct idetape_bh *bh = pc->bh;
310 (unsigned int)(bh->b_size - atomic_read(&bh->b_count)),
312 drive->hwif->tp_ops->input_data(drive, NULL, bh->b_data +
313 atomic_read(&bh->b_count), count);
315 atomic_add(count, &bh->b_count);
316 if (atomic_read(&bh->b_count) == bh->b_size) {
319 atomic_set(&bh->b_count, 0);
328 static int idetape_output_buffers(ide_drive_t *drive, struct ide_atapi_pc *pc,
331 struct idetape_bh *bh = pc->bh;
337 count = min((unsigned int)pc->b_count, (unsigned int)bcount);
338 drive->hwif->tp_ops->output_data(drive, NULL, pc->b_data, count);
341 pc->b_count -= count;
346 pc->b_data = bh->b_data;
347 pc->b_count = atomic_read(&bh->b_count);
355 static void idetape_update_buffers(ide_drive_t *drive, struct ide_atapi_pc *pc)
357 struct idetape_bh *bh = pc->bh;
359 unsigned int bcount = pc->xferred;
361 if (pc->flags & PC_FLAG_WRITING)
365 printk(KERN_ERR "ide-tape: bh == NULL in %s\n",
369 count = min((unsigned int)bh->b_size, (unsigned int)bcount);
370 atomic_set(&bh->b_count, count);
371 if (atomic_read(&bh->b_count) == bh->b_size)
379 * called on each failed packet command retry to analyze the request sense. We
380 * currently do not utilize this information.
382 static void idetape_analyze_error(ide_drive_t *drive, u8 *sense)
384 idetape_tape_t *tape = drive->driver_data;
385 struct ide_atapi_pc *pc = drive->failed_pc;
387 tape->sense_key = sense[2] & 0xF;
388 tape->asc = sense[12];
389 tape->ascq = sense[13];
391 debug_log(DBG_ERR, "pc = %x, sense key = %x, asc = %x, ascq = %x\n",
392 pc->c[0], tape->sense_key, tape->asc, tape->ascq);
394 /* Correct pc->xferred by asking the tape. */
395 if (pc->flags & PC_FLAG_DMA_ERROR) {
396 pc->xferred = pc->req_xfer -
398 get_unaligned_be32(&sense[3]);
399 idetape_update_buffers(drive, pc);
403 * If error was the result of a zero-length read or write command,
404 * with sense key=5, asc=0x22, ascq=0, let it slide. Some drives
405 * (i.e. Seagate STT3401A Travan) don't support 0-length read/writes.
407 if ((pc->c[0] == READ_6 || pc->c[0] == WRITE_6)
409 && pc->c[4] == 0 && pc->c[3] == 0 && pc->c[2] == 0) {
410 if (tape->sense_key == 5) {
411 /* don't report an error, everything's ok */
413 /* don't retry read/write */
414 pc->flags |= PC_FLAG_ABORT;
417 if (pc->c[0] == READ_6 && (sense[2] & 0x80)) {
418 pc->error = IDE_DRV_ERROR_FILEMARK;
419 pc->flags |= PC_FLAG_ABORT;
421 if (pc->c[0] == WRITE_6) {
422 if ((sense[2] & 0x40) || (tape->sense_key == 0xd
423 && tape->asc == 0x0 && tape->ascq == 0x2)) {
424 pc->error = IDE_DRV_ERROR_EOD;
425 pc->flags |= PC_FLAG_ABORT;
428 if (pc->c[0] == READ_6 || pc->c[0] == WRITE_6) {
429 if (tape->sense_key == 8) {
430 pc->error = IDE_DRV_ERROR_EOD;
431 pc->flags |= PC_FLAG_ABORT;
433 if (!(pc->flags & PC_FLAG_ABORT) &&
435 pc->retries = IDETAPE_MAX_PC_RETRIES + 1;
439 /* Free data buffers completely. */
440 static void ide_tape_kfree_buffer(idetape_tape_t *tape)
442 struct idetape_bh *prev_bh, *bh = tape->merge_bh;
445 u32 size = bh->b_size;
448 unsigned int order = fls(size >> PAGE_SHIFT)-1;
451 free_pages((unsigned long)bh->b_data, order);
454 bh->b_data += (1 << order) * PAGE_SIZE;
462 static void ide_tape_handle_dsc(ide_drive_t *);
464 static int ide_tape_callback(ide_drive_t *drive, int dsc)
466 idetape_tape_t *tape = drive->driver_data;
467 struct ide_atapi_pc *pc = drive->pc;
468 struct request *rq = drive->hwif->rq;
469 int uptodate = pc->error ? 0 : 1;
470 int err = uptodate ? 0 : IDE_DRV_ERROR_GENERAL;
472 debug_log(DBG_PROCS, "Enter %s\n", __func__);
475 ide_tape_handle_dsc(drive);
477 if (drive->failed_pc == pc)
478 drive->failed_pc = NULL;
480 if (pc->c[0] == REQUEST_SENSE) {
482 idetape_analyze_error(drive, pc->buf);
484 printk(KERN_ERR "ide-tape: Error in REQUEST SENSE "
485 "itself - Aborting request!\n");
486 } else if (pc->c[0] == READ_6 || pc->c[0] == WRITE_6) {
487 int blocks = pc->xferred / tape->blk_size;
489 tape->avg_size += blocks * tape->blk_size;
491 if (time_after_eq(jiffies, tape->avg_time + HZ)) {
492 tape->avg_speed = tape->avg_size * HZ /
493 (jiffies - tape->avg_time) / 1024;
495 tape->avg_time = jiffies;
498 tape->first_frame += blocks;
499 rq->current_nr_sectors -= blocks;
505 } else if (pc->c[0] == READ_POSITION && uptodate) {
506 u8 *readpos = pc->buf;
508 debug_log(DBG_SENSE, "BOP - %s\n",
509 (readpos[0] & 0x80) ? "Yes" : "No");
510 debug_log(DBG_SENSE, "EOP - %s\n",
511 (readpos[0] & 0x40) ? "Yes" : "No");
513 if (readpos[0] & 0x4) {
514 printk(KERN_INFO "ide-tape: Block location is unknown"
516 clear_bit(IDE_AFLAG_ADDRESS_VALID, &drive->atapi_flags);
518 err = IDE_DRV_ERROR_GENERAL;
520 debug_log(DBG_SENSE, "Block Location - %u\n",
521 be32_to_cpup((__be32 *)&readpos[4]));
523 tape->partition = readpos[1];
524 tape->first_frame = be32_to_cpup((__be32 *)&readpos[4]);
525 set_bit(IDE_AFLAG_ADDRESS_VALID, &drive->atapi_flags);
535 * Postpone the current request so that ide.c will be able to service requests
536 * from another device on the same port while we are polling for DSC.
538 static void idetape_postpone_request(ide_drive_t *drive)
540 idetape_tape_t *tape = drive->driver_data;
542 debug_log(DBG_PROCS, "Enter %s\n", __func__);
544 tape->postponed_rq = drive->hwif->rq;
546 ide_stall_queue(drive, tape->dsc_poll_freq);
549 static void ide_tape_handle_dsc(ide_drive_t *drive)
551 idetape_tape_t *tape = drive->driver_data;
553 /* Media access command */
554 tape->dsc_polling_start = jiffies;
555 tape->dsc_poll_freq = IDETAPE_DSC_MA_FAST;
556 tape->dsc_timeout = jiffies + IDETAPE_DSC_MA_TIMEOUT;
557 /* Allow ide.c to handle other requests */
558 idetape_postpone_request(drive);
561 static int ide_tape_io_buffers(ide_drive_t *drive, struct ide_atapi_pc *pc,
562 unsigned int bcount, int write)
567 bleft = idetape_output_buffers(drive, pc, bcount);
569 bleft = idetape_input_buffers(drive, pc, bcount);
571 return bcount - bleft;
575 * Packet Command Interface
577 * The current Packet Command is available in drive->pc, and will not change
578 * until we finish handling it. Each packet command is associated with a
579 * callback function that will be called when the command is finished.
581 * The handling will be done in three stages:
583 * 1. ide_tape_issue_pc will send the packet command to the drive, and will set
584 * the interrupt handler to ide_pc_intr.
586 * 2. On each interrupt, ide_pc_intr will be called. This step will be
587 * repeated until the device signals us that no more interrupts will be issued.
589 * 3. ATAPI Tape media access commands have immediate status with a delayed
590 * process. In case of a successful initiation of a media access packet command,
591 * the DSC bit will be set when the actual execution of the command is finished.
592 * Since the tape drive will not issue an interrupt, we have to poll for this
593 * event. In this case, we define the request as "low priority request" by
594 * setting rq_status to IDETAPE_RQ_POSTPONED, set a timer to poll for DSC and
597 * ide.c will then give higher priority to requests which originate from the
598 * other device, until will change rq_status to RQ_ACTIVE.
600 * 4. When the packet command is finished, it will be checked for errors.
602 * 5. In case an error was found, we queue a request sense packet command in
603 * front of the request queue and retry the operation up to
604 * IDETAPE_MAX_PC_RETRIES times.
606 * 6. In case no error was found, or we decided to give up and not to retry
607 * again, the callback function will be called and then we will handle the next
611 static ide_startstop_t ide_tape_issue_pc(ide_drive_t *drive,
613 struct ide_atapi_pc *pc)
615 idetape_tape_t *tape = drive->driver_data;
617 if (drive->failed_pc == NULL && pc->c[0] != REQUEST_SENSE)
618 drive->failed_pc = pc;
620 /* Set the current packet command */
623 if (pc->retries > IDETAPE_MAX_PC_RETRIES ||
624 (pc->flags & PC_FLAG_ABORT)) {
626 * We will "abort" retrying a packet command in case legitimate
627 * error code was received (crossing a filemark, or end of the
628 * media, for example).
630 if (!(pc->flags & PC_FLAG_ABORT)) {
631 if (!(pc->c[0] == TEST_UNIT_READY &&
632 tape->sense_key == 2 && tape->asc == 4 &&
633 (tape->ascq == 1 || tape->ascq == 8))) {
634 printk(KERN_ERR "ide-tape: %s: I/O error, "
635 "pc = %2x, key = %2x, "
636 "asc = %2x, ascq = %2x\n",
637 tape->name, pc->c[0],
638 tape->sense_key, tape->asc,
642 pc->error = IDE_DRV_ERROR_GENERAL;
644 drive->failed_pc = NULL;
645 drive->pc_callback(drive, 0);
648 debug_log(DBG_SENSE, "Retry #%d, cmd = %02X\n", pc->retries, pc->c[0]);
652 return ide_issue_pc(drive, cmd);
655 /* A mode sense command is used to "sense" tape parameters. */
656 static void idetape_create_mode_sense_cmd(struct ide_atapi_pc *pc, u8 page_code)
659 pc->c[0] = MODE_SENSE;
660 if (page_code != IDETAPE_BLOCK_DESCRIPTOR)
661 /* DBD = 1 - Don't return block descriptors */
663 pc->c[2] = page_code;
665 * Changed pc->c[3] to 0 (255 will at best return unused info).
667 * For SCSI this byte is defined as subpage instead of high byte
668 * of length and some IDE drives seem to interpret it this way
669 * and return an error when 255 is used.
672 /* We will just discard data in that case */
674 if (page_code == IDETAPE_BLOCK_DESCRIPTOR)
676 else if (page_code == IDETAPE_CAPABILITIES_PAGE)
682 static ide_startstop_t idetape_media_access_finished(ide_drive_t *drive)
684 ide_hwif_t *hwif = drive->hwif;
685 idetape_tape_t *tape = drive->driver_data;
686 struct ide_atapi_pc *pc = drive->pc;
689 stat = hwif->tp_ops->read_status(hwif);
691 if (stat & ATA_DSC) {
692 if (stat & ATA_ERR) {
694 if (pc->c[0] != TEST_UNIT_READY)
695 printk(KERN_ERR "ide-tape: %s: I/O error, ",
697 /* Retry operation */
703 pc->error = IDE_DRV_ERROR_GENERAL;
704 drive->failed_pc = NULL;
706 drive->pc_callback(drive, 0);
710 static void ide_tape_create_rw_cmd(idetape_tape_t *tape,
711 struct ide_atapi_pc *pc, struct request *rq,
714 struct idetape_bh *bh = (struct idetape_bh *)rq->special;
715 unsigned int length = rq->current_nr_sectors;
718 put_unaligned(cpu_to_be32(length), (unsigned int *) &pc->c[1]);
722 pc->buf_size = length * tape->blk_size;
723 pc->req_xfer = pc->buf_size;
724 if (pc->req_xfer == tape->buffer_size)
725 pc->flags |= PC_FLAG_DMA_OK;
727 if (opcode == READ_6) {
729 atomic_set(&bh->b_count, 0);
730 } else if (opcode == WRITE_6) {
732 pc->flags |= PC_FLAG_WRITING;
733 pc->b_data = bh->b_data;
734 pc->b_count = atomic_read(&bh->b_count);
737 memcpy(rq->cmd, pc->c, 12);
740 static ide_startstop_t idetape_do_request(ide_drive_t *drive,
741 struct request *rq, sector_t block)
743 ide_hwif_t *hwif = drive->hwif;
744 idetape_tape_t *tape = drive->driver_data;
745 struct ide_atapi_pc *pc = NULL;
746 struct request *postponed_rq = tape->postponed_rq;
750 debug_log(DBG_SENSE, "sector: %llu, nr_sectors: %lu,"
751 " current_nr_sectors: %u\n",
752 (unsigned long long)rq->sector, rq->nr_sectors,
753 rq->current_nr_sectors);
755 if (!(blk_special_request(rq) || blk_sense_request(rq))) {
756 /* We do not support buffer cache originated requests. */
757 printk(KERN_NOTICE "ide-tape: %s: Unsupported request in "
758 "request queue (%d)\n", drive->name, rq->cmd_type);
759 if (blk_fs_request(rq) == 0 && rq->errors == 0)
761 ide_complete_rq(drive, -EIO, ide_rq_bytes(rq));
765 /* Retry a failed packet command */
766 if (drive->failed_pc && drive->pc->c[0] == REQUEST_SENSE) {
767 pc = drive->failed_pc;
771 if (postponed_rq != NULL)
772 if (rq != postponed_rq) {
773 printk(KERN_ERR "ide-tape: ide-tape.c bug - "
774 "Two DSC requests were queued\n");
775 drive->failed_pc = NULL;
777 ide_complete_rq(drive, 0, blk_rq_bytes(rq));
781 tape->postponed_rq = NULL;
784 * If the tape is still busy, postpone our request and service
785 * the other device meanwhile.
787 stat = hwif->tp_ops->read_status(hwif);
789 if ((drive->dev_flags & IDE_DFLAG_DSC_OVERLAP) == 0 &&
790 (rq->cmd[13] & REQ_IDETAPE_PC2) == 0)
791 set_bit(IDE_AFLAG_IGNORE_DSC, &drive->atapi_flags);
793 if (drive->dev_flags & IDE_DFLAG_POST_RESET) {
794 set_bit(IDE_AFLAG_IGNORE_DSC, &drive->atapi_flags);
795 drive->dev_flags &= ~IDE_DFLAG_POST_RESET;
798 if (!test_and_clear_bit(IDE_AFLAG_IGNORE_DSC, &drive->atapi_flags) &&
799 (stat & ATA_DSC) == 0) {
800 if (postponed_rq == NULL) {
801 tape->dsc_polling_start = jiffies;
802 tape->dsc_poll_freq = tape->best_dsc_rw_freq;
803 tape->dsc_timeout = jiffies + IDETAPE_DSC_RW_TIMEOUT;
804 } else if (time_after(jiffies, tape->dsc_timeout)) {
805 printk(KERN_ERR "ide-tape: %s: DSC timeout\n",
807 if (rq->cmd[13] & REQ_IDETAPE_PC2) {
808 idetape_media_access_finished(drive);
811 return ide_do_reset(drive);
813 } else if (time_after(jiffies,
814 tape->dsc_polling_start +
815 IDETAPE_DSC_MA_THRESHOLD))
816 tape->dsc_poll_freq = IDETAPE_DSC_MA_SLOW;
817 idetape_postpone_request(drive);
820 if (rq->cmd[13] & REQ_IDETAPE_READ) {
821 pc = &tape->queued_pc;
822 ide_tape_create_rw_cmd(tape, pc, rq, READ_6);
825 if (rq->cmd[13] & REQ_IDETAPE_WRITE) {
826 pc = &tape->queued_pc;
827 ide_tape_create_rw_cmd(tape, pc, rq, WRITE_6);
830 if (rq->cmd[13] & REQ_IDETAPE_PC1) {
831 pc = (struct ide_atapi_pc *)rq->special;
832 rq->cmd[13] &= ~(REQ_IDETAPE_PC1);
833 rq->cmd[13] |= REQ_IDETAPE_PC2;
836 if (rq->cmd[13] & REQ_IDETAPE_PC2) {
837 idetape_media_access_finished(drive);
843 /* prepare sense request for this command */
844 ide_prep_sense(drive, rq);
846 memset(&cmd, 0, sizeof(cmd));
849 cmd.tf_flags |= IDE_TFLAG_WRITE;
853 return ide_tape_issue_pc(drive, &cmd, pc);
857 * The function below uses __get_free_pages to allocate a data buffer of size
858 * tape->buffer_size (or a bit more). We attempt to combine sequential pages as
861 * It returns a pointer to the newly allocated buffer, or NULL in case of
864 static struct idetape_bh *ide_tape_kmalloc_buffer(idetape_tape_t *tape,
867 struct idetape_bh *prev_bh, *bh, *merge_bh;
868 int pages = tape->pages_per_buffer;
869 unsigned int order, b_allocd;
872 merge_bh = kmalloc(sizeof(struct idetape_bh), GFP_KERNEL);
877 order = fls(pages) - 1;
878 bh->b_data = (char *) __get_free_pages(GFP_KERNEL, order);
881 b_allocd = (1 << order) * PAGE_SIZE;
885 memset(bh->b_data, 0, b_allocd);
886 bh->b_reqnext = NULL;
887 bh->b_size = b_allocd;
888 atomic_set(&bh->b_count, full ? bh->b_size : 0);
891 order = fls(pages) - 1;
892 b_data = (char *) __get_free_pages(GFP_KERNEL, order);
895 b_allocd = (1 << order) * PAGE_SIZE;
898 memset(b_data, 0, b_allocd);
900 /* newly allocated page frames below buffer header or ...*/
901 if (bh->b_data == b_data + b_allocd) {
902 bh->b_size += b_allocd;
903 bh->b_data -= b_allocd;
905 atomic_add(b_allocd, &bh->b_count);
908 /* they are above the header */
909 if (b_data == bh->b_data + bh->b_size) {
910 bh->b_size += b_allocd;
912 atomic_add(b_allocd, &bh->b_count);
916 bh = kmalloc(sizeof(struct idetape_bh), GFP_KERNEL);
918 free_pages((unsigned long) b_data, order);
921 bh->b_reqnext = NULL;
923 bh->b_size = b_allocd;
924 atomic_set(&bh->b_count, full ? bh->b_size : 0);
925 prev_bh->b_reqnext = bh;
930 bh->b_size -= tape->excess_bh_size;
932 atomic_sub(tape->excess_bh_size, &bh->b_count);
935 ide_tape_kfree_buffer(tape);
939 static int idetape_copy_stage_from_user(idetape_tape_t *tape,
940 const char __user *buf, int n)
942 struct idetape_bh *bh = tape->bh;
948 printk(KERN_ERR "ide-tape: bh == NULL in %s\n",
952 count = min((unsigned int)
953 (bh->b_size - atomic_read(&bh->b_count)),
955 if (copy_from_user(bh->b_data + atomic_read(&bh->b_count), buf,
959 atomic_add(count, &bh->b_count);
961 if (atomic_read(&bh->b_count) == bh->b_size) {
964 atomic_set(&bh->b_count, 0);
971 static int idetape_copy_stage_to_user(idetape_tape_t *tape, char __user *buf,
974 struct idetape_bh *bh = tape->bh;
980 printk(KERN_ERR "ide-tape: bh == NULL in %s\n",
984 count = min(tape->b_count, n);
985 if (copy_to_user(buf, tape->b_data, count))
988 tape->b_data += count;
989 tape->b_count -= count;
991 if (!tape->b_count) {
995 tape->b_data = bh->b_data;
996 tape->b_count = atomic_read(&bh->b_count);
1003 static void idetape_init_merge_buffer(idetape_tape_t *tape)
1005 struct idetape_bh *bh = tape->merge_bh;
1006 tape->bh = tape->merge_bh;
1008 if (tape->chrdev_dir == IDETAPE_DIR_WRITE)
1009 atomic_set(&bh->b_count, 0);
1011 tape->b_data = bh->b_data;
1012 tape->b_count = atomic_read(&bh->b_count);
1017 * Write a filemark if write_filemark=1. Flush the device buffers without
1018 * writing a filemark otherwise.
1020 static void idetape_create_write_filemark_cmd(ide_drive_t *drive,
1021 struct ide_atapi_pc *pc, int write_filemark)
1024 pc->c[0] = WRITE_FILEMARKS;
1025 pc->c[4] = write_filemark;
1026 pc->flags |= PC_FLAG_WAIT_FOR_DSC;
1029 static int idetape_wait_ready(ide_drive_t *drive, unsigned long timeout)
1031 idetape_tape_t *tape = drive->driver_data;
1032 struct gendisk *disk = tape->disk;
1033 int load_attempted = 0;
1035 /* Wait for the tape to become ready */
1036 set_bit(IDE_AFLAG_MEDIUM_PRESENT, &drive->atapi_flags);
1038 while (time_before(jiffies, timeout)) {
1039 if (ide_do_test_unit_ready(drive, disk) == 0)
1041 if ((tape->sense_key == 2 && tape->asc == 4 && tape->ascq == 2)
1042 || (tape->asc == 0x3A)) {
1046 ide_do_start_stop(drive, disk, IDETAPE_LU_LOAD_MASK);
1048 /* not about to be ready */
1049 } else if (!(tape->sense_key == 2 && tape->asc == 4 &&
1050 (tape->ascq == 1 || tape->ascq == 8)))
1057 static int idetape_flush_tape_buffers(ide_drive_t *drive)
1059 struct ide_tape_obj *tape = drive->driver_data;
1060 struct ide_atapi_pc pc;
1063 idetape_create_write_filemark_cmd(drive, &pc, 0);
1064 rc = ide_queue_pc_tail(drive, tape->disk, &pc);
1067 idetape_wait_ready(drive, 60 * 5 * HZ);
1071 static void idetape_create_read_position_cmd(struct ide_atapi_pc *pc)
1074 pc->c[0] = READ_POSITION;
1078 static int idetape_read_position(ide_drive_t *drive)
1080 idetape_tape_t *tape = drive->driver_data;
1081 struct ide_atapi_pc pc;
1084 debug_log(DBG_PROCS, "Enter %s\n", __func__);
1086 idetape_create_read_position_cmd(&pc);
1087 if (ide_queue_pc_tail(drive, tape->disk, &pc))
1089 position = tape->first_frame;
1093 static void idetape_create_locate_cmd(ide_drive_t *drive,
1094 struct ide_atapi_pc *pc,
1095 unsigned int block, u8 partition, int skip)
1098 pc->c[0] = POSITION_TO_ELEMENT;
1100 put_unaligned(cpu_to_be32(block), (unsigned int *) &pc->c[3]);
1101 pc->c[8] = partition;
1102 pc->flags |= PC_FLAG_WAIT_FOR_DSC;
1105 static void __ide_tape_discard_merge_buffer(ide_drive_t *drive)
1107 idetape_tape_t *tape = drive->driver_data;
1109 if (tape->chrdev_dir != IDETAPE_DIR_READ)
1112 clear_bit(IDE_AFLAG_FILEMARK, &drive->atapi_flags);
1113 tape->merge_bh_size = 0;
1114 if (tape->merge_bh != NULL) {
1115 ide_tape_kfree_buffer(tape);
1116 tape->merge_bh = NULL;
1119 tape->chrdev_dir = IDETAPE_DIR_NONE;
1123 * Position the tape to the requested block using the LOCATE packet command.
1124 * A READ POSITION command is then issued to check where we are positioned. Like
1125 * all higher level operations, we queue the commands at the tail of the request
1126 * queue and wait for their completion.
1128 static int idetape_position_tape(ide_drive_t *drive, unsigned int block,
1129 u8 partition, int skip)
1131 idetape_tape_t *tape = drive->driver_data;
1132 struct gendisk *disk = tape->disk;
1134 struct ide_atapi_pc pc;
1136 if (tape->chrdev_dir == IDETAPE_DIR_READ)
1137 __ide_tape_discard_merge_buffer(drive);
1138 idetape_wait_ready(drive, 60 * 5 * HZ);
1139 idetape_create_locate_cmd(drive, &pc, block, partition, skip);
1140 retval = ide_queue_pc_tail(drive, disk, &pc);
1144 idetape_create_read_position_cmd(&pc);
1145 return ide_queue_pc_tail(drive, disk, &pc);
1148 static void ide_tape_discard_merge_buffer(ide_drive_t *drive,
1149 int restore_position)
1151 idetape_tape_t *tape = drive->driver_data;
1154 __ide_tape_discard_merge_buffer(drive);
1155 if (restore_position) {
1156 position = idetape_read_position(drive);
1157 seek = position > 0 ? position : 0;
1158 if (idetape_position_tape(drive, seek, 0, 0)) {
1159 printk(KERN_INFO "ide-tape: %s: position_tape failed in"
1160 " %s\n", tape->name, __func__);
1167 * Generate a read/write request for the block device interface and wait for it
1170 static int idetape_queue_rw_tail(ide_drive_t *drive, int cmd, int blocks,
1171 struct idetape_bh *bh)
1173 idetape_tape_t *tape = drive->driver_data;
1177 debug_log(DBG_SENSE, "%s: cmd=%d\n", __func__, cmd);
1179 rq = blk_get_request(drive->queue, READ, __GFP_WAIT);
1180 rq->cmd_type = REQ_TYPE_SPECIAL;
1182 rq->rq_disk = tape->disk;
1183 rq->special = (void *)bh;
1184 rq->sector = tape->first_frame;
1185 rq->nr_sectors = blocks;
1186 rq->current_nr_sectors = blocks;
1187 blk_execute_rq(drive->queue, tape->disk, rq, 0);
1189 errors = rq->errors;
1190 ret = tape->blk_size * (blocks - rq->current_nr_sectors);
1191 blk_put_request(rq);
1193 if ((cmd & (REQ_IDETAPE_READ | REQ_IDETAPE_WRITE)) == 0)
1197 idetape_init_merge_buffer(tape);
1198 if (errors == IDE_DRV_ERROR_GENERAL)
1203 static void idetape_create_inquiry_cmd(struct ide_atapi_pc *pc)
1211 static void idetape_create_rewind_cmd(ide_drive_t *drive,
1212 struct ide_atapi_pc *pc)
1215 pc->c[0] = REZERO_UNIT;
1216 pc->flags |= PC_FLAG_WAIT_FOR_DSC;
1219 static void idetape_create_erase_cmd(struct ide_atapi_pc *pc)
1224 pc->flags |= PC_FLAG_WAIT_FOR_DSC;
1227 static void idetape_create_space_cmd(struct ide_atapi_pc *pc, int count, u8 cmd)
1231 put_unaligned(cpu_to_be32(count), (unsigned int *) &pc->c[1]);
1233 pc->flags |= PC_FLAG_WAIT_FOR_DSC;
1236 /* Queue up a character device originated write request. */
1237 static int idetape_add_chrdev_write_request(ide_drive_t *drive, int blocks)
1239 idetape_tape_t *tape = drive->driver_data;
1241 debug_log(DBG_CHRDEV, "Enter %s\n", __func__);
1243 return idetape_queue_rw_tail(drive, REQ_IDETAPE_WRITE,
1244 blocks, tape->merge_bh);
1247 static void ide_tape_flush_merge_buffer(ide_drive_t *drive)
1249 idetape_tape_t *tape = drive->driver_data;
1251 struct idetape_bh *bh;
1253 if (tape->chrdev_dir != IDETAPE_DIR_WRITE) {
1254 printk(KERN_ERR "ide-tape: bug: Trying to empty merge buffer"
1255 " but we are not writing.\n");
1258 if (tape->merge_bh_size > tape->buffer_size) {
1259 printk(KERN_ERR "ide-tape: bug: merge_buffer too big\n");
1260 tape->merge_bh_size = tape->buffer_size;
1262 if (tape->merge_bh_size) {
1263 blocks = tape->merge_bh_size / tape->blk_size;
1264 if (tape->merge_bh_size % tape->blk_size) {
1268 i = tape->blk_size - tape->merge_bh_size %
1270 bh = tape->bh->b_reqnext;
1272 atomic_set(&bh->b_count, 0);
1278 printk(KERN_INFO "ide-tape: bug,"
1282 min = min(i, (unsigned int)(bh->b_size -
1283 atomic_read(&bh->b_count)));
1284 memset(bh->b_data + atomic_read(&bh->b_count),
1286 atomic_add(min, &bh->b_count);
1291 (void) idetape_add_chrdev_write_request(drive, blocks);
1292 tape->merge_bh_size = 0;
1294 if (tape->merge_bh != NULL) {
1295 ide_tape_kfree_buffer(tape);
1296 tape->merge_bh = NULL;
1298 tape->chrdev_dir = IDETAPE_DIR_NONE;
1301 static int idetape_init_read(ide_drive_t *drive)
1303 idetape_tape_t *tape = drive->driver_data;
1306 /* Initialize read operation */
1307 if (tape->chrdev_dir != IDETAPE_DIR_READ) {
1308 if (tape->chrdev_dir == IDETAPE_DIR_WRITE) {
1309 ide_tape_flush_merge_buffer(drive);
1310 idetape_flush_tape_buffers(drive);
1312 if (tape->merge_bh || tape->merge_bh_size) {
1313 printk(KERN_ERR "ide-tape: merge_bh_size should be"
1315 tape->merge_bh_size = 0;
1317 tape->merge_bh = ide_tape_kmalloc_buffer(tape, 0, 0);
1318 if (!tape->merge_bh)
1320 tape->chrdev_dir = IDETAPE_DIR_READ;
1323 * Issue a read 0 command to ensure that DSC handshake is
1324 * switched from completion mode to buffer available mode.
1325 * No point in issuing this if DSC overlap isn't supported, some
1326 * drives (Seagate STT3401A) will return an error.
1328 if (drive->dev_flags & IDE_DFLAG_DSC_OVERLAP) {
1329 bytes_read = idetape_queue_rw_tail(drive,
1330 REQ_IDETAPE_READ, 0,
1332 if (bytes_read < 0) {
1333 ide_tape_kfree_buffer(tape);
1334 tape->merge_bh = NULL;
1335 tape->chrdev_dir = IDETAPE_DIR_NONE;
1344 /* called from idetape_chrdev_read() to service a chrdev read request. */
1345 static int idetape_add_chrdev_read_request(ide_drive_t *drive, int blocks)
1347 idetape_tape_t *tape = drive->driver_data;
1349 debug_log(DBG_PROCS, "Enter %s, %d blocks\n", __func__, blocks);
1351 /* If we are at a filemark, return a read length of 0 */
1352 if (test_bit(IDE_AFLAG_FILEMARK, &drive->atapi_flags))
1355 idetape_init_read(drive);
1357 return idetape_queue_rw_tail(drive, REQ_IDETAPE_READ, blocks,
1361 static void idetape_pad_zeros(ide_drive_t *drive, int bcount)
1363 idetape_tape_t *tape = drive->driver_data;
1364 struct idetape_bh *bh;
1370 bh = tape->merge_bh;
1371 count = min(tape->buffer_size, bcount);
1373 blocks = count / tape->blk_size;
1375 atomic_set(&bh->b_count,
1376 min(count, (unsigned int)bh->b_size));
1377 memset(bh->b_data, 0, atomic_read(&bh->b_count));
1378 count -= atomic_read(&bh->b_count);
1381 idetape_queue_rw_tail(drive, REQ_IDETAPE_WRITE, blocks,
1387 * Rewinds the tape to the Beginning Of the current Partition (BOP). We
1388 * currently support only one partition.
1390 static int idetape_rewind_tape(ide_drive_t *drive)
1392 struct ide_tape_obj *tape = drive->driver_data;
1393 struct gendisk *disk = tape->disk;
1395 struct ide_atapi_pc pc;
1397 debug_log(DBG_SENSE, "Enter %s\n", __func__);
1399 idetape_create_rewind_cmd(drive, &pc);
1400 retval = ide_queue_pc_tail(drive, disk, &pc);
1404 idetape_create_read_position_cmd(&pc);
1405 retval = ide_queue_pc_tail(drive, disk, &pc);
1411 /* mtio.h compatible commands should be issued to the chrdev interface. */
1412 static int idetape_blkdev_ioctl(ide_drive_t *drive, unsigned int cmd,
1415 idetape_tape_t *tape = drive->driver_data;
1416 void __user *argp = (void __user *)arg;
1418 struct idetape_config {
1419 int dsc_rw_frequency;
1420 int dsc_media_access_frequency;
1424 debug_log(DBG_PROCS, "Enter %s\n", __func__);
1428 if (copy_from_user(&config, argp, sizeof(config)))
1430 tape->best_dsc_rw_freq = config.dsc_rw_frequency;
1433 config.dsc_rw_frequency = (int) tape->best_dsc_rw_freq;
1434 config.nr_stages = 1;
1435 if (copy_to_user(argp, &config, sizeof(config)))
1444 static int idetape_space_over_filemarks(ide_drive_t *drive, short mt_op,
1447 idetape_tape_t *tape = drive->driver_data;
1448 struct gendisk *disk = tape->disk;
1449 struct ide_atapi_pc pc;
1450 int retval, count = 0;
1451 int sprev = !!(tape->caps[4] & 0x20);
1455 if (MTBSF == mt_op || MTBSFM == mt_op) {
1458 mt_count = -mt_count;
1461 if (tape->chrdev_dir == IDETAPE_DIR_READ) {
1462 tape->merge_bh_size = 0;
1463 if (test_and_clear_bit(IDE_AFLAG_FILEMARK, &drive->atapi_flags))
1465 ide_tape_discard_merge_buffer(drive, 0);
1471 idetape_create_space_cmd(&pc, mt_count - count,
1472 IDETAPE_SPACE_OVER_FILEMARK);
1473 return ide_queue_pc_tail(drive, disk, &pc);
1478 retval = idetape_space_over_filemarks(drive, MTFSF,
1482 count = (MTBSFM == mt_op ? 1 : -1);
1483 return idetape_space_over_filemarks(drive, MTFSF, count);
1485 printk(KERN_ERR "ide-tape: MTIO operation %d not supported\n",
1492 * Our character device read / write functions.
1494 * The tape is optimized to maximize throughput when it is transferring an
1495 * integral number of the "continuous transfer limit", which is a parameter of
1496 * the specific tape (26kB on my particular tape, 32kB for Onstream).
1498 * As of version 1.3 of the driver, the character device provides an abstract
1499 * continuous view of the media - any mix of block sizes (even 1 byte) on the
1500 * same backup/restore procedure is supported. The driver will internally
1501 * convert the requests to the recommended transfer unit, so that an unmatch
1502 * between the user's block size to the recommended size will only result in a
1503 * (slightly) increased driver overhead, but will no longer hit performance.
1504 * This is not applicable to Onstream.
1506 static ssize_t idetape_chrdev_read(struct file *file, char __user *buf,
1507 size_t count, loff_t *ppos)
1509 struct ide_tape_obj *tape = file->private_data;
1510 ide_drive_t *drive = tape->drive;
1511 ssize_t bytes_read, temp, actually_read = 0, rc;
1513 u16 ctl = *(u16 *)&tape->caps[12];
1515 debug_log(DBG_CHRDEV, "Enter %s, count %Zd\n", __func__, count);
1517 if (tape->chrdev_dir != IDETAPE_DIR_READ) {
1518 if (test_bit(IDE_AFLAG_DETECT_BS, &drive->atapi_flags))
1519 if (count > tape->blk_size &&
1520 (count % tape->blk_size) == 0)
1521 tape->user_bs_factor = count / tape->blk_size;
1523 rc = idetape_init_read(drive);
1528 if (tape->merge_bh_size) {
1529 actually_read = min((unsigned int)(tape->merge_bh_size),
1530 (unsigned int)count);
1531 if (idetape_copy_stage_to_user(tape, buf, actually_read))
1533 buf += actually_read;
1534 tape->merge_bh_size -= actually_read;
1535 count -= actually_read;
1537 while (count >= tape->buffer_size) {
1538 bytes_read = idetape_add_chrdev_read_request(drive, ctl);
1539 if (bytes_read <= 0)
1541 if (idetape_copy_stage_to_user(tape, buf, bytes_read))
1544 count -= bytes_read;
1545 actually_read += bytes_read;
1548 bytes_read = idetape_add_chrdev_read_request(drive, ctl);
1549 if (bytes_read <= 0)
1551 temp = min((unsigned long)count, (unsigned long)bytes_read);
1552 if (idetape_copy_stage_to_user(tape, buf, temp))
1554 actually_read += temp;
1555 tape->merge_bh_size = bytes_read-temp;
1558 if (!actually_read && test_bit(IDE_AFLAG_FILEMARK, &drive->atapi_flags)) {
1559 debug_log(DBG_SENSE, "%s: spacing over filemark\n", tape->name);
1561 idetape_space_over_filemarks(drive, MTFSF, 1);
1565 return ret ? ret : actually_read;
1568 static ssize_t idetape_chrdev_write(struct file *file, const char __user *buf,
1569 size_t count, loff_t *ppos)
1571 struct ide_tape_obj *tape = file->private_data;
1572 ide_drive_t *drive = tape->drive;
1573 ssize_t actually_written = 0;
1575 u16 ctl = *(u16 *)&tape->caps[12];
1577 /* The drive is write protected. */
1578 if (tape->write_prot)
1581 debug_log(DBG_CHRDEV, "Enter %s, count %Zd\n", __func__, count);
1583 /* Initialize write operation */
1584 if (tape->chrdev_dir != IDETAPE_DIR_WRITE) {
1585 if (tape->chrdev_dir == IDETAPE_DIR_READ)
1586 ide_tape_discard_merge_buffer(drive, 1);
1587 if (tape->merge_bh || tape->merge_bh_size) {
1588 printk(KERN_ERR "ide-tape: merge_bh_size "
1589 "should be 0 now\n");
1590 tape->merge_bh_size = 0;
1592 tape->merge_bh = ide_tape_kmalloc_buffer(tape, 0, 0);
1593 if (!tape->merge_bh)
1595 tape->chrdev_dir = IDETAPE_DIR_WRITE;
1596 idetape_init_merge_buffer(tape);
1599 * Issue a write 0 command to ensure that DSC handshake is
1600 * switched from completion mode to buffer available mode. No
1601 * point in issuing this if DSC overlap isn't supported, some
1602 * drives (Seagate STT3401A) will return an error.
1604 if (drive->dev_flags & IDE_DFLAG_DSC_OVERLAP) {
1605 ssize_t retval = idetape_queue_rw_tail(drive,
1606 REQ_IDETAPE_WRITE, 0,
1609 ide_tape_kfree_buffer(tape);
1610 tape->merge_bh = NULL;
1611 tape->chrdev_dir = IDETAPE_DIR_NONE;
1618 if (tape->merge_bh_size) {
1619 if (tape->merge_bh_size >= tape->buffer_size) {
1620 printk(KERN_ERR "ide-tape: bug: merge buf too big\n");
1621 tape->merge_bh_size = 0;
1623 actually_written = min((unsigned int)
1624 (tape->buffer_size - tape->merge_bh_size),
1625 (unsigned int)count);
1626 if (idetape_copy_stage_from_user(tape, buf, actually_written))
1628 buf += actually_written;
1629 tape->merge_bh_size += actually_written;
1630 count -= actually_written;
1632 if (tape->merge_bh_size == tape->buffer_size) {
1634 tape->merge_bh_size = 0;
1635 retval = idetape_add_chrdev_write_request(drive, ctl);
1640 while (count >= tape->buffer_size) {
1642 if (idetape_copy_stage_from_user(tape, buf, tape->buffer_size))
1644 buf += tape->buffer_size;
1645 count -= tape->buffer_size;
1646 retval = idetape_add_chrdev_write_request(drive, ctl);
1647 actually_written += tape->buffer_size;
1652 actually_written += count;
1653 if (idetape_copy_stage_from_user(tape, buf, count))
1655 tape->merge_bh_size += count;
1657 return ret ? ret : actually_written;
1660 static int idetape_write_filemark(ide_drive_t *drive)
1662 struct ide_tape_obj *tape = drive->driver_data;
1663 struct ide_atapi_pc pc;
1665 /* Write a filemark */
1666 idetape_create_write_filemark_cmd(drive, &pc, 1);
1667 if (ide_queue_pc_tail(drive, tape->disk, &pc)) {
1668 printk(KERN_ERR "ide-tape: Couldn't write a filemark\n");
1675 * Called from idetape_chrdev_ioctl when the general mtio MTIOCTOP ioctl is
1678 * Note: MTBSF and MTBSFM are not supported when the tape doesn't support
1679 * spacing over filemarks in the reverse direction. In this case, MTFSFM is also
1680 * usually not supported.
1682 * The following commands are currently not supported:
1684 * MTFSS, MTBSS, MTWSM, MTSETDENSITY, MTSETDRVBUFFER, MT_ST_BOOLEANS,
1685 * MT_ST_WRITE_THRESHOLD.
1687 static int idetape_mtioctop(ide_drive_t *drive, short mt_op, int mt_count)
1689 idetape_tape_t *tape = drive->driver_data;
1690 struct gendisk *disk = tape->disk;
1691 struct ide_atapi_pc pc;
1694 debug_log(DBG_ERR, "Handling MTIOCTOP ioctl: mt_op=%d, mt_count=%d\n",
1704 return idetape_space_over_filemarks(drive, mt_op, mt_count);
1711 if (tape->write_prot)
1713 ide_tape_discard_merge_buffer(drive, 1);
1714 for (i = 0; i < mt_count; i++) {
1715 retval = idetape_write_filemark(drive);
1721 ide_tape_discard_merge_buffer(drive, 0);
1722 if (idetape_rewind_tape(drive))
1726 ide_tape_discard_merge_buffer(drive, 0);
1727 return ide_do_start_stop(drive, disk, IDETAPE_LU_LOAD_MASK);
1731 * If door is locked, attempt to unlock before
1732 * attempting to eject.
1734 if (tape->door_locked) {
1735 if (!ide_set_media_lock(drive, disk, 0))
1736 tape->door_locked = DOOR_UNLOCKED;
1738 ide_tape_discard_merge_buffer(drive, 0);
1739 retval = ide_do_start_stop(drive, disk, !IDETAPE_LU_LOAD_MASK);
1741 clear_bit(IDE_AFLAG_MEDIUM_PRESENT, &drive->atapi_flags);
1744 ide_tape_discard_merge_buffer(drive, 0);
1745 return idetape_flush_tape_buffers(drive);
1747 ide_tape_discard_merge_buffer(drive, 0);
1748 return ide_do_start_stop(drive, disk,
1749 IDETAPE_LU_RETENSION_MASK | IDETAPE_LU_LOAD_MASK);
1751 idetape_create_space_cmd(&pc, 0, IDETAPE_SPACE_TO_EOD);
1752 return ide_queue_pc_tail(drive, disk, &pc);
1754 (void)idetape_rewind_tape(drive);
1755 idetape_create_erase_cmd(&pc);
1756 return ide_queue_pc_tail(drive, disk, &pc);
1759 if (mt_count < tape->blk_size ||
1760 mt_count % tape->blk_size)
1762 tape->user_bs_factor = mt_count / tape->blk_size;
1763 clear_bit(IDE_AFLAG_DETECT_BS, &drive->atapi_flags);
1765 set_bit(IDE_AFLAG_DETECT_BS, &drive->atapi_flags);
1768 ide_tape_discard_merge_buffer(drive, 0);
1769 return idetape_position_tape(drive,
1770 mt_count * tape->user_bs_factor, tape->partition, 0);
1772 ide_tape_discard_merge_buffer(drive, 0);
1773 return idetape_position_tape(drive, 0, mt_count, 0);
1777 retval = ide_set_media_lock(drive, disk, 1);
1780 tape->door_locked = DOOR_EXPLICITLY_LOCKED;
1783 retval = ide_set_media_lock(drive, disk, 0);
1786 tape->door_locked = DOOR_UNLOCKED;
1789 printk(KERN_ERR "ide-tape: MTIO operation %d not supported\n",
1796 * Our character device ioctls. General mtio.h magnetic io commands are
1797 * supported here, and not in the corresponding block interface. Our own
1798 * ide-tape ioctls are supported on both interfaces.
1800 static int idetape_chrdev_ioctl(struct inode *inode, struct file *file,
1801 unsigned int cmd, unsigned long arg)
1803 struct ide_tape_obj *tape = file->private_data;
1804 ide_drive_t *drive = tape->drive;
1808 int block_offset = 0, position = tape->first_frame;
1809 void __user *argp = (void __user *)arg;
1811 debug_log(DBG_CHRDEV, "Enter %s, cmd=%u\n", __func__, cmd);
1813 if (tape->chrdev_dir == IDETAPE_DIR_WRITE) {
1814 ide_tape_flush_merge_buffer(drive);
1815 idetape_flush_tape_buffers(drive);
1817 if (cmd == MTIOCGET || cmd == MTIOCPOS) {
1818 block_offset = tape->merge_bh_size /
1819 (tape->blk_size * tape->user_bs_factor);
1820 position = idetape_read_position(drive);
1826 if (copy_from_user(&mtop, argp, sizeof(struct mtop)))
1828 return idetape_mtioctop(drive, mtop.mt_op, mtop.mt_count);
1830 memset(&mtget, 0, sizeof(struct mtget));
1831 mtget.mt_type = MT_ISSCSI2;
1832 mtget.mt_blkno = position / tape->user_bs_factor - block_offset;
1834 ((tape->blk_size * tape->user_bs_factor)
1835 << MT_ST_BLKSIZE_SHIFT) & MT_ST_BLKSIZE_MASK;
1837 if (tape->drv_write_prot)
1838 mtget.mt_gstat |= GMT_WR_PROT(0xffffffff);
1840 if (copy_to_user(argp, &mtget, sizeof(struct mtget)))
1844 mtpos.mt_blkno = position / tape->user_bs_factor - block_offset;
1845 if (copy_to_user(argp, &mtpos, sizeof(struct mtpos)))
1849 if (tape->chrdev_dir == IDETAPE_DIR_READ)
1850 ide_tape_discard_merge_buffer(drive, 1);
1851 return idetape_blkdev_ioctl(drive, cmd, arg);
1856 * Do a mode sense page 0 with block descriptor and if it succeeds set the tape
1857 * block size with the reported value.
1859 static void ide_tape_get_bsize_from_bdesc(ide_drive_t *drive)
1861 idetape_tape_t *tape = drive->driver_data;
1862 struct ide_atapi_pc pc;
1864 idetape_create_mode_sense_cmd(&pc, IDETAPE_BLOCK_DESCRIPTOR);
1865 if (ide_queue_pc_tail(drive, tape->disk, &pc)) {
1866 printk(KERN_ERR "ide-tape: Can't get block descriptor\n");
1867 if (tape->blk_size == 0) {
1868 printk(KERN_WARNING "ide-tape: Cannot deal with zero "
1869 "block size, assuming 32k\n");
1870 tape->blk_size = 32768;
1874 tape->blk_size = (pc.buf[4 + 5] << 16) +
1875 (pc.buf[4 + 6] << 8) +
1877 tape->drv_write_prot = (pc.buf[2] & 0x80) >> 7;
1880 static int idetape_chrdev_open(struct inode *inode, struct file *filp)
1882 unsigned int minor = iminor(inode), i = minor & ~0xc0;
1884 idetape_tape_t *tape;
1887 if (i >= MAX_HWIFS * MAX_DRIVES)
1891 tape = ide_tape_chrdev_get(i);
1897 debug_log(DBG_CHRDEV, "Enter %s\n", __func__);
1900 * We really want to do nonseekable_open(inode, filp); here, but some
1901 * versions of tar incorrectly call lseek on tapes and bail out if that
1902 * fails. So we disallow pread() and pwrite(), but permit lseeks.
1904 filp->f_mode &= ~(FMODE_PREAD | FMODE_PWRITE);
1906 drive = tape->drive;
1908 filp->private_data = tape;
1910 if (test_and_set_bit(IDE_AFLAG_BUSY, &drive->atapi_flags)) {
1915 retval = idetape_wait_ready(drive, 60 * HZ);
1917 clear_bit(IDE_AFLAG_BUSY, &drive->atapi_flags);
1918 printk(KERN_ERR "ide-tape: %s: drive not ready\n", tape->name);
1922 idetape_read_position(drive);
1923 if (!test_bit(IDE_AFLAG_ADDRESS_VALID, &drive->atapi_flags))
1924 (void)idetape_rewind_tape(drive);
1926 /* Read block size and write protect status from drive. */
1927 ide_tape_get_bsize_from_bdesc(drive);
1929 /* Set write protect flag if device is opened as read-only. */
1930 if ((filp->f_flags & O_ACCMODE) == O_RDONLY)
1931 tape->write_prot = 1;
1933 tape->write_prot = tape->drv_write_prot;
1935 /* Make sure drive isn't write protected if user wants to write. */
1936 if (tape->write_prot) {
1937 if ((filp->f_flags & O_ACCMODE) == O_WRONLY ||
1938 (filp->f_flags & O_ACCMODE) == O_RDWR) {
1939 clear_bit(IDE_AFLAG_BUSY, &drive->atapi_flags);
1945 /* Lock the tape drive door so user can't eject. */
1946 if (tape->chrdev_dir == IDETAPE_DIR_NONE) {
1947 if (!ide_set_media_lock(drive, tape->disk, 1)) {
1948 if (tape->door_locked != DOOR_EXPLICITLY_LOCKED)
1949 tape->door_locked = DOOR_LOCKED;
1961 static void idetape_write_release(ide_drive_t *drive, unsigned int minor)
1963 idetape_tape_t *tape = drive->driver_data;
1965 ide_tape_flush_merge_buffer(drive);
1966 tape->merge_bh = ide_tape_kmalloc_buffer(tape, 1, 0);
1967 if (tape->merge_bh != NULL) {
1968 idetape_pad_zeros(drive, tape->blk_size *
1969 (tape->user_bs_factor - 1));
1970 ide_tape_kfree_buffer(tape);
1971 tape->merge_bh = NULL;
1973 idetape_write_filemark(drive);
1974 idetape_flush_tape_buffers(drive);
1975 idetape_flush_tape_buffers(drive);
1978 static int idetape_chrdev_release(struct inode *inode, struct file *filp)
1980 struct ide_tape_obj *tape = filp->private_data;
1981 ide_drive_t *drive = tape->drive;
1982 unsigned int minor = iminor(inode);
1985 tape = drive->driver_data;
1987 debug_log(DBG_CHRDEV, "Enter %s\n", __func__);
1989 if (tape->chrdev_dir == IDETAPE_DIR_WRITE)
1990 idetape_write_release(drive, minor);
1991 if (tape->chrdev_dir == IDETAPE_DIR_READ) {
1993 ide_tape_discard_merge_buffer(drive, 1);
1996 if (minor < 128 && test_bit(IDE_AFLAG_MEDIUM_PRESENT, &drive->atapi_flags))
1997 (void) idetape_rewind_tape(drive);
1998 if (tape->chrdev_dir == IDETAPE_DIR_NONE) {
1999 if (tape->door_locked == DOOR_LOCKED) {
2000 if (!ide_set_media_lock(drive, tape->disk, 0))
2001 tape->door_locked = DOOR_UNLOCKED;
2004 clear_bit(IDE_AFLAG_BUSY, &drive->atapi_flags);
2010 static void idetape_get_inquiry_results(ide_drive_t *drive)
2012 idetape_tape_t *tape = drive->driver_data;
2013 struct ide_atapi_pc pc;
2015 char fw_rev[4], vendor_id[8], product_id[16];
2017 idetape_create_inquiry_cmd(&pc);
2018 pc.buf = &pc_buf[0];
2019 pc.buf_size = sizeof(pc_buf);
2021 if (ide_queue_pc_tail(drive, tape->disk, &pc)) {
2022 printk(KERN_ERR "ide-tape: %s: can't get INQUIRY results\n",
2026 memcpy(vendor_id, &pc.buf[8], 8);
2027 memcpy(product_id, &pc.buf[16], 16);
2028 memcpy(fw_rev, &pc.buf[32], 4);
2030 ide_fixstring(vendor_id, 8, 0);
2031 ide_fixstring(product_id, 16, 0);
2032 ide_fixstring(fw_rev, 4, 0);
2034 printk(KERN_INFO "ide-tape: %s <-> %s: %.8s %.16s rev %.4s\n",
2035 drive->name, tape->name, vendor_id, product_id, fw_rev);
2039 * Ask the tape about its various parameters. In particular, we will adjust our
2040 * data transfer buffer size to the recommended value as returned by the tape.
2042 static void idetape_get_mode_sense_results(ide_drive_t *drive)
2044 idetape_tape_t *tape = drive->driver_data;
2045 struct ide_atapi_pc pc;
2047 u8 speed, max_speed;
2049 idetape_create_mode_sense_cmd(&pc, IDETAPE_CAPABILITIES_PAGE);
2050 if (ide_queue_pc_tail(drive, tape->disk, &pc)) {
2051 printk(KERN_ERR "ide-tape: Can't get tape parameters - assuming"
2052 " some default values\n");
2053 tape->blk_size = 512;
2054 put_unaligned(52, (u16 *)&tape->caps[12]);
2055 put_unaligned(540, (u16 *)&tape->caps[14]);
2056 put_unaligned(6*52, (u16 *)&tape->caps[16]);
2059 caps = pc.buf + 4 + pc.buf[3];
2061 /* convert to host order and save for later use */
2062 speed = be16_to_cpup((__be16 *)&caps[14]);
2063 max_speed = be16_to_cpup((__be16 *)&caps[8]);
2065 *(u16 *)&caps[8] = max_speed;
2066 *(u16 *)&caps[12] = be16_to_cpup((__be16 *)&caps[12]);
2067 *(u16 *)&caps[14] = speed;
2068 *(u16 *)&caps[16] = be16_to_cpup((__be16 *)&caps[16]);
2071 printk(KERN_INFO "ide-tape: %s: invalid tape speed "
2072 "(assuming 650KB/sec)\n", drive->name);
2073 *(u16 *)&caps[14] = 650;
2076 printk(KERN_INFO "ide-tape: %s: invalid max_speed "
2077 "(assuming 650KB/sec)\n", drive->name);
2078 *(u16 *)&caps[8] = 650;
2081 memcpy(&tape->caps, caps, 20);
2083 /* device lacks locking support according to capabilities page */
2084 if ((caps[6] & 1) == 0)
2085 drive->dev_flags &= ~IDE_DFLAG_DOORLOCKING;
2088 tape->blk_size = 512;
2089 else if (caps[7] & 0x04)
2090 tape->blk_size = 1024;
2093 #ifdef CONFIG_IDE_PROC_FS
2094 #define ide_tape_devset_get(name, field) \
2095 static int get_##name(ide_drive_t *drive) \
2097 idetape_tape_t *tape = drive->driver_data; \
2098 return tape->field; \
2101 #define ide_tape_devset_set(name, field) \
2102 static int set_##name(ide_drive_t *drive, int arg) \
2104 idetape_tape_t *tape = drive->driver_data; \
2105 tape->field = arg; \
2109 #define ide_tape_devset_rw_field(_name, _field) \
2110 ide_tape_devset_get(_name, _field) \
2111 ide_tape_devset_set(_name, _field) \
2112 IDE_DEVSET(_name, DS_SYNC, get_##_name, set_##_name)
2114 #define ide_tape_devset_r_field(_name, _field) \
2115 ide_tape_devset_get(_name, _field) \
2116 IDE_DEVSET(_name, 0, get_##_name, NULL)
2118 static int mulf_tdsc(ide_drive_t *drive) { return 1000; }
2119 static int divf_tdsc(ide_drive_t *drive) { return HZ; }
2120 static int divf_buffer(ide_drive_t *drive) { return 2; }
2121 static int divf_buffer_size(ide_drive_t *drive) { return 1024; }
2123 ide_devset_rw_flag(dsc_overlap, IDE_DFLAG_DSC_OVERLAP);
2125 ide_tape_devset_rw_field(debug_mask, debug_mask);
2126 ide_tape_devset_rw_field(tdsc, best_dsc_rw_freq);
2128 ide_tape_devset_r_field(avg_speed, avg_speed);
2129 ide_tape_devset_r_field(speed, caps[14]);
2130 ide_tape_devset_r_field(buffer, caps[16]);
2131 ide_tape_devset_r_field(buffer_size, buffer_size);
2133 static const struct ide_proc_devset idetape_settings[] = {
2134 __IDE_PROC_DEVSET(avg_speed, 0, 0xffff, NULL, NULL),
2135 __IDE_PROC_DEVSET(buffer, 0, 0xffff, NULL, divf_buffer),
2136 __IDE_PROC_DEVSET(buffer_size, 0, 0xffff, NULL, divf_buffer_size),
2137 __IDE_PROC_DEVSET(debug_mask, 0, 0xffff, NULL, NULL),
2138 __IDE_PROC_DEVSET(dsc_overlap, 0, 1, NULL, NULL),
2139 __IDE_PROC_DEVSET(speed, 0, 0xffff, NULL, NULL),
2140 __IDE_PROC_DEVSET(tdsc, IDETAPE_DSC_RW_MIN, IDETAPE_DSC_RW_MAX,
2141 mulf_tdsc, divf_tdsc),
2147 * The function below is called to:
2149 * 1. Initialize our various state variables.
2150 * 2. Ask the tape for its capabilities.
2151 * 3. Allocate a buffer which will be used for data transfer. The buffer size
2152 * is chosen based on the recommendation which we received in step 2.
2154 * Note that at this point ide.c already assigned us an irq, so that we can
2155 * queue requests here and wait for their completion.
2157 static void idetape_setup(ide_drive_t *drive, idetape_tape_t *tape, int minor)
2162 u16 *ctl = (u16 *)&tape->caps[12];
2164 drive->pc_callback = ide_tape_callback;
2165 drive->pc_update_buffers = idetape_update_buffers;
2166 drive->pc_io_buffers = ide_tape_io_buffers;
2168 drive->dev_flags |= IDE_DFLAG_DSC_OVERLAP;
2170 if (drive->hwif->host_flags & IDE_HFLAG_NO_DSC) {
2171 printk(KERN_INFO "ide-tape: %s: disabling DSC overlap\n",
2173 drive->dev_flags &= ~IDE_DFLAG_DSC_OVERLAP;
2176 /* Seagate Travan drives do not support DSC overlap. */
2177 if (strstr((char *)&drive->id[ATA_ID_PROD], "Seagate STT3401"))
2178 drive->dev_flags &= ~IDE_DFLAG_DSC_OVERLAP;
2180 tape->minor = minor;
2181 tape->name[0] = 'h';
2182 tape->name[1] = 't';
2183 tape->name[2] = '0' + minor;
2184 tape->chrdev_dir = IDETAPE_DIR_NONE;
2186 idetape_get_inquiry_results(drive);
2187 idetape_get_mode_sense_results(drive);
2188 ide_tape_get_bsize_from_bdesc(drive);
2189 tape->user_bs_factor = 1;
2190 tape->buffer_size = *ctl * tape->blk_size;
2191 while (tape->buffer_size > 0xffff) {
2192 printk(KERN_NOTICE "ide-tape: decreasing stage size\n");
2194 tape->buffer_size = *ctl * tape->blk_size;
2196 buffer_size = tape->buffer_size;
2197 tape->pages_per_buffer = buffer_size / PAGE_SIZE;
2198 if (buffer_size % PAGE_SIZE) {
2199 tape->pages_per_buffer++;
2200 tape->excess_bh_size = PAGE_SIZE - buffer_size % PAGE_SIZE;
2203 /* select the "best" DSC read/write polling freq */
2204 speed = max(*(u16 *)&tape->caps[14], *(u16 *)&tape->caps[8]);
2206 t = (IDETAPE_FIFO_THRESHOLD * tape->buffer_size * HZ) / (speed * 1000);
2209 * Ensure that the number we got makes sense; limit it within
2210 * IDETAPE_DSC_RW_MIN and IDETAPE_DSC_RW_MAX.
2212 tape->best_dsc_rw_freq = clamp_t(unsigned long, t, IDETAPE_DSC_RW_MIN,
2213 IDETAPE_DSC_RW_MAX);
2214 printk(KERN_INFO "ide-tape: %s <-> %s: %dKBps, %d*%dkB buffer, "
2216 drive->name, tape->name, *(u16 *)&tape->caps[14],
2217 (*(u16 *)&tape->caps[16] * 512) / tape->buffer_size,
2218 tape->buffer_size / 1024,
2219 tape->best_dsc_rw_freq * 1000 / HZ,
2220 (drive->dev_flags & IDE_DFLAG_USING_DMA) ? ", DMA" : "");
2222 ide_proc_register_driver(drive, tape->driver);
2225 static void ide_tape_remove(ide_drive_t *drive)
2227 idetape_tape_t *tape = drive->driver_data;
2229 ide_proc_unregister_driver(drive, tape->driver);
2230 device_del(&tape->dev);
2231 ide_unregister_region(tape->disk);
2233 mutex_lock(&idetape_ref_mutex);
2234 put_device(&tape->dev);
2235 mutex_unlock(&idetape_ref_mutex);
2238 static void ide_tape_release(struct device *dev)
2240 struct ide_tape_obj *tape = to_ide_drv(dev, ide_tape_obj);
2241 ide_drive_t *drive = tape->drive;
2242 struct gendisk *g = tape->disk;
2244 BUG_ON(tape->merge_bh_size);
2246 drive->dev_flags &= ~IDE_DFLAG_DSC_OVERLAP;
2247 drive->driver_data = NULL;
2248 device_destroy(idetape_sysfs_class, MKDEV(IDETAPE_MAJOR, tape->minor));
2249 device_destroy(idetape_sysfs_class,
2250 MKDEV(IDETAPE_MAJOR, tape->minor + 128));
2251 idetape_devs[tape->minor] = NULL;
2252 g->private_data = NULL;
2257 #ifdef CONFIG_IDE_PROC_FS
2258 static int proc_idetape_read_name
2259 (char *page, char **start, off_t off, int count, int *eof, void *data)
2261 ide_drive_t *drive = (ide_drive_t *) data;
2262 idetape_tape_t *tape = drive->driver_data;
2266 len = sprintf(out, "%s\n", tape->name);
2267 PROC_IDE_READ_RETURN(page, start, off, count, eof, len);
2270 static ide_proc_entry_t idetape_proc[] = {
2271 { "capacity", S_IFREG|S_IRUGO, proc_ide_read_capacity, NULL },
2272 { "name", S_IFREG|S_IRUGO, proc_idetape_read_name, NULL },
2273 { NULL, 0, NULL, NULL }
2276 static ide_proc_entry_t *ide_tape_proc_entries(ide_drive_t *drive)
2278 return idetape_proc;
2281 static const struct ide_proc_devset *ide_tape_proc_devsets(ide_drive_t *drive)
2283 return idetape_settings;
2287 static int ide_tape_probe(ide_drive_t *);
2289 static struct ide_driver idetape_driver = {
2291 .owner = THIS_MODULE,
2293 .bus = &ide_bus_type,
2295 .probe = ide_tape_probe,
2296 .remove = ide_tape_remove,
2297 .version = IDETAPE_VERSION,
2298 .do_request = idetape_do_request,
2299 #ifdef CONFIG_IDE_PROC_FS
2300 .proc_entries = ide_tape_proc_entries,
2301 .proc_devsets = ide_tape_proc_devsets,
2305 /* Our character device supporting functions, passed to register_chrdev. */
2306 static const struct file_operations idetape_fops = {
2307 .owner = THIS_MODULE,
2308 .read = idetape_chrdev_read,
2309 .write = idetape_chrdev_write,
2310 .ioctl = idetape_chrdev_ioctl,
2311 .open = idetape_chrdev_open,
2312 .release = idetape_chrdev_release,
2315 static int idetape_open(struct block_device *bdev, fmode_t mode)
2317 struct ide_tape_obj *tape = ide_tape_get(bdev->bd_disk);
2325 static int idetape_release(struct gendisk *disk, fmode_t mode)
2327 struct ide_tape_obj *tape = ide_drv_g(disk, ide_tape_obj);
2333 static int idetape_ioctl(struct block_device *bdev, fmode_t mode,
2334 unsigned int cmd, unsigned long arg)
2336 struct ide_tape_obj *tape = ide_drv_g(bdev->bd_disk, ide_tape_obj);
2337 ide_drive_t *drive = tape->drive;
2338 int err = generic_ide_ioctl(drive, bdev, cmd, arg);
2340 err = idetape_blkdev_ioctl(drive, cmd, arg);
2344 static struct block_device_operations idetape_block_ops = {
2345 .owner = THIS_MODULE,
2346 .open = idetape_open,
2347 .release = idetape_release,
2348 .locked_ioctl = idetape_ioctl,
2351 static int ide_tape_probe(ide_drive_t *drive)
2353 idetape_tape_t *tape;
2357 if (!strstr("ide-tape", drive->driver_req))
2360 if (drive->media != ide_tape)
2363 if ((drive->dev_flags & IDE_DFLAG_ID_READ) &&
2364 ide_check_atapi_device(drive, DRV_NAME) == 0) {
2365 printk(KERN_ERR "ide-tape: %s: not supported by this version of"
2366 " the driver\n", drive->name);
2369 tape = kzalloc(sizeof(idetape_tape_t), GFP_KERNEL);
2371 printk(KERN_ERR "ide-tape: %s: Can't allocate a tape struct\n",
2376 g = alloc_disk(1 << PARTN_BITS);
2380 ide_init_disk(g, drive);
2382 tape->dev.parent = &drive->gendev;
2383 tape->dev.release = ide_tape_release;
2384 dev_set_name(&tape->dev, dev_name(&drive->gendev));
2386 if (device_register(&tape->dev))
2389 tape->drive = drive;
2390 tape->driver = &idetape_driver;
2393 g->private_data = &tape->driver;
2395 drive->driver_data = tape;
2397 mutex_lock(&idetape_ref_mutex);
2398 for (minor = 0; idetape_devs[minor]; minor++)
2400 idetape_devs[minor] = tape;
2401 mutex_unlock(&idetape_ref_mutex);
2403 idetape_setup(drive, tape, minor);
2405 device_create(idetape_sysfs_class, &drive->gendev,
2406 MKDEV(IDETAPE_MAJOR, minor), NULL, "%s", tape->name);
2407 device_create(idetape_sysfs_class, &drive->gendev,
2408 MKDEV(IDETAPE_MAJOR, minor + 128), NULL,
2411 g->fops = &idetape_block_ops;
2412 ide_register_region(g);
2424 static void __exit idetape_exit(void)
2426 driver_unregister(&idetape_driver.gen_driver);
2427 class_destroy(idetape_sysfs_class);
2428 unregister_chrdev(IDETAPE_MAJOR, "ht");
2431 static int __init idetape_init(void)
2434 idetape_sysfs_class = class_create(THIS_MODULE, "ide_tape");
2435 if (IS_ERR(idetape_sysfs_class)) {
2436 idetape_sysfs_class = NULL;
2437 printk(KERN_ERR "Unable to create sysfs class for ide tapes\n");
2442 if (register_chrdev(IDETAPE_MAJOR, "ht", &idetape_fops)) {
2443 printk(KERN_ERR "ide-tape: Failed to register chrdev"
2446 goto out_free_class;
2449 error = driver_register(&idetape_driver.gen_driver);
2451 goto out_free_driver;
2456 driver_unregister(&idetape_driver.gen_driver);
2458 class_destroy(idetape_sysfs_class);
2463 MODULE_ALIAS("ide:*m-tape*");
2464 module_init(idetape_init);
2465 module_exit(idetape_exit);
2466 MODULE_ALIAS_CHARDEV_MAJOR(IDETAPE_MAJOR);
2467 MODULE_DESCRIPTION("ATAPI Streaming TAPE Driver");
2468 MODULE_LICENSE("GPL");